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DJ

Div John

Published in

October 26, 2026

· Updated: October 26, 2026

The AI briefing for Developers

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The extension a developer installed three years ago can probably read everything they do in the browser today.

That is the short answer to the privacy question. A browser extension is not a harmless toolbar icon. With the appropriate permissions, it has full access to all web page contents, cookies, and network requests. It can see every open tab, including cloud consoles, and even incognito windows if the user has allowed the extension to run there.…